Thanks guys - the 80% figure is the one the school suggested. My intention was to try to be 100% ready to take the exams in the first few days as I want to be able to get on with the practical side.
I've managed to track down a ppl confuser online and had a go on the pplquiz demo, both of which hopefully will be useful.
On a further study note, did you guys just self study from the books or did you use other online stuff, maybe videos classes etc.
I'm thinking that learning stuff like the 'flight computer' are easier to learn by demonstration.
All suggestions welcome - though as I am backpacking at the moment, online and pdf stuff would be great as carrying a hard copy library around the Far East isn't a fun prospect...